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Let S = {x | x is a positive multiple of 3 less than 100}

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Let S = {x | x is a positive multiple of 3 less than 100} P = {x | x is a prime number less than 20}. Then n(S) + n(P) is

(A) 34 

(B) 31 

(C) 33 

(D) 30

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Answer is (B) 31

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